<?  
class smtp
{ 
   /* Public Variables */ 
   var $smtp_port;   //邮件服务器端口
   var $time_out;   //超时时间
   var $host_name;   //主机名称
   var $log_file;   //日志文件
   var $relay_host; //
   var $debug; 
   var $auth; 
   var $user;    //用户名
   var $pass;    //密码 
   var $sock;
   /* Constractor */ 
   function smtp($relay_host, $smtp_port,$auth,$user,$pass) 
   {
   // echo $relay_host." ".$smtp_port." ".$auth." ".$user." ".$pass;
    $this->debug = FALSE; 
    $this->smtp_port = $smtp_port; 
    $this->relay_host = $relay_host; 
    $this->time_out = 30;//is used in fsockopen() 
    $this->auth = $auth;//auth 
    $this->user = $user; 
    $this->pass = $pass; 
    $this->host_name = "localhost";//is used in HELO command 
    $this->log_file = "";
    $this->sock = FALSE; 
   }
   
   /* Main Function */
   function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "")
   {
    $mail_from = $this->get_address($this->strip_comment($from)); 
    $body = ereg_replace("(^|(\r\n))(\.)", "\1.\3", $body); 
    $header .= "MIME-Version:1.0\r\n"; 
    if($mailtype=="HTML"){ 
     $header .= "Content-Type:text/html\r\n"; 
    }
    $header .= "To: ".$to."\r\n"; 
    if ($cc != "") { 
     $header .= "Cc: ".$cc."\r\n"; 
    } 
    $header .= "From: $from<".$from.">\r\n"; 
    $header .= "Subject: ".$subject."\r\n"; 
    $header .= $additional_headers;
    $header .= "Date: ".date("r")."\r\n"; 
    $header .= "X-Mailer:By Redhat (PHP/".phpversion().")\r\n"; 
    list($msec, $sec) = explode(" ", microtime()); 
    $header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from.">\r\n"; 
    $TO = explode(",", $this->strip_comment($to));
    if ($cc != "") { 
     $TO = array_merge($TO, explode(",", $this->strip_comment($cc))); 
    }
    if ($bcc != "") { 
    $TO = array_merge($TO, explode(",", $this->strip_comment($bcc))); 
    }
    $sent = TRUE; 
    foreach ($TO as $rcpt_to) {
     $rcpt_to = $this->get_address($rcpt_to);
     if (!$this->smtp_sockopen($rcpt_to)) { 
      $this->log_write("Error: Cannot send email to ".$rcpt_to."\n"); 
      $sent = FALSE; 
      continue; 
     } 
     if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) { 
      $this->log_write("E-mail has been sent to <".$rcpt_to.">\n"); 
     } 
     else { 
      $this->log_write("Error: Cannot send email to <".$rcpt_to.">\n"); 
      $sent = FALSE; 
     }
     fclose($this->sock); 
     $this->log_write("Disconnected from remote host\n"); 
    } 
    return $sent; 
   } 

   /* Private Functions */
   function smtp_send($helo, $from, $to, $header, $body = "") 
   { 
    if (!$this->smtp_putcmd("HELO", $helo)) { 
     return $this->smtp_error("sending HELO command"); 
    }
    if($this->auth){
     if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) { 
       return $this->smtp_error("sending HELO command"); 
     }
     if (!$this->smtp_putcmd("", base64_encode($this->pass))) { 
      return $this->smtp_error("sending HELO command"); 
     } 
    }
    if (!$this->smtp_putcmd("MAIL", "FROM:<".$from.">")) {
     return $this->smtp_error("sending MAIL FROM command"); 
    } 
    if (!$this->smtp_putcmd("RCPT", "TO:<".$to.">")) { 
     return $this->smtp_error("sending RCPT TO command"); 
    }
    if (!$this->smtp_putcmd("DATA")) { 
     return $this->smtp_error("sending DATA command"); 
    }
    if (!$this->smtp_message($header, $body)) { 
     return $this->smtp_error("sending message"); 
    }
    if (!$this->smtp_eom()) { 
     return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]"); 
    }
    if (!$this->smtp_putcmd("QUIT")) { 
     return $this->smtp_error("sending QUIT command");
    }
    return TRUE;
   }
   
   function smtp_sockopen($address) 
   { 
    if ($this->relay_host == "") { 
     return $this->smtp_sockopen_mx($address); 
    } else { 
     return $this->smtp_sockopen_relay(); 
    } 
   }
   
   function smtp_sockopen_relay()
   {
    $this->log_write("Trying to ".$this->relay_host.":".$this->smtp_port."\n"); 
    $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out); 
    if (!($this->sock && $this->smtp_ok())) {
     $this->log_write("Error: Cannot connenct to relay host ".$this->relay_host."\n"); 
     $this->log_write("Error: ".$errstr." (".$errno.")\n");
     return FALSE; 
    } 
    $this->log_write("Connected to relay host ".$this->relay_host."\n");
    return TRUE;
   }
   
   function smtp_sockopen_mx($address) 
   { 
    $domain = ereg_replace("^.+@([^@]+)$", "\1", $address);
    if (!@getmxrr($domain, $MXHOSTS)) { 
     $this->log_write("Error: Cannot resolve MX \"".$domain."\"\n"); 
     return FALSE; 
    }
    foreach ($MXHOSTS as $host) { 
     $this->log_write("Trying to ".$host.":".$this->smtp_port."\n"); 
     $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out); 
     if (!($this->sock && $this->smtp_ok())) { 
      $this->log_write("Warning: Cannot connect to mx host ".$host."\n");
      $this->log_write("Error: ".$errstr." (".$errno.")\n"); 
      continue; 
     }
     $this->log_write("Connected to mx host ".$host."\n"); 
     return TRUE; 
    } 
    $this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).")\n"); 
    return FALSE; 
   }
   
   function smtp_message($header, $body) 
   { 
    fputs($this->sock, $header."\r\n".$body); 
    $this->smtp_debug("> ".str_replace("\r\n", "\n"."> ", $header."\n> ".$body."\n> ")); 
    return TRUE; 
   }
  
   function smtp_eom() 
   { 
    fputs($this->sock, "\r\n.\r\n"); 
    $this->smtp_debug(". [EOM]\n"); 
    return $this->smtp_ok(); 
   }

   function smtp_ok() 
   { 
    $response = str_replace("\r\n", "", fgets($this->sock, 512));
    $this->smtp_debug($response."\n");
    if (!ereg("^[23]", $response)) {
     fputs($this->sock, "QUIT\r\n"); 
     fgets($this->sock, 512); 
     $this->log_write("Error: Remote host returned \"".$response."\"\n"); 
     return FALSE; 
    } 
    return TRUE;
   }
   
   function smtp_putcmd($cmd, $arg = "") 
   { 
    if ($arg != "") { 
    if($cmd=="") $cmd = $arg; 
     else $cmd = $cmd." ".$arg; 
    }
    fputs($this->sock, $cmd."\r\n"); 
    $this->smtp_debug("> ".$cmd."\n");
    return $this->smtp_ok();
   }
  
   function smtp_error($string)
   { 
    $this->log_write("Error: Error occurred while ".$string.".\n"); 
    return FALSE;
   }
   
   function log_write($message) 
   { 
    $this->smtp_debug($message); 
    if ($this->log_file == "") {
     return TRUE; 
    }
    $message = date("M d H:i:s ").get_current_user()."[".getmypid()."]: ".$message;
    if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) { 
     $this->smtp_debug("Warning: Cannot open log file \"".$this->log_file."\"\n");
     return FALSE;;
    } 
    flock($fp, LOCK_EX); 
    fputs($fp, $message); 
    fclose($fp);
    return TRUE; 
   }
  
   function strip_comment($address) 
   { 
    $comment = "\([^()]*\)"; 
    while (ereg($comment, $address)) { 
     $address = ereg_replace($comment, "", $address); 
    }
    return $address; 
   }
   
   function get_address($address)
   { 
    $address = ereg_replace("([ \t\r\n])+", "", $address); 
    $address = ereg_replace("^.*<(.+)>.*$", "\1", $address);
    return $address;
   }
  
   function smtp_debug($message) 
   { 
    if ($this->debug) { 
     //echo $message; 
    } 
   } 
}
/*发送示例*/

?>